Punching machine and the like



April 5, 1938. P: c. KLINGLER ET AL PUNCHiNG MIQCHINE AND THE LIKE 6Sheets-Sheet 1 Filed Aug. 5, 1936 5 VJ I m i & 0 min Y mnz M mnfi m MW nTumwl WM 5 B April 5, 1938. P. c. KLlNGLER ET AL PUNCHING MACHINE ANDTHE LIKE Filed Aug. 3, 1956 6 Sheets-Sheet 2 km -.r 4 S N C W mmfi m y mmm WITNESS Wmww April 5, 1 938. P. c. KLINGLER ET AL 2,112,350

PUNCHING MAQHINE AND THE LIKE Filed'Aug. 3, 1936 6 Sheets-Sheet 3 .ZIT

WITNESSES:

IN VEN TOR$= I PM; 5. mm Mr 12 y gory: 5.55 725 55;,

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April 5, 1938- P. c. KLINGLER ET AL 2,112,350

PUNCHING MACHINE AND THE LIKE Filed Aug. 5, 1936 6 Sheets-Sheet 4WITNESSES: INVLjNTORS:

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5 (a; qgorga 5.56 flag J 1 i A TTORNEYS.

April 5, 1938. P. c. KLINGLER ET AL. 2,112,350

PUNCHING MACHINE AND THE LIKE Fild Aug. s, 1956 6 Sheets-Sheet 5 53 2 11.9 52, M 59: FIG--Y I ITNESSES: 1 9 Q INlfENTORS:

5g Paul LZKZmgZzr Z W By e orye 5.5chgjzy,

April 5, 1938- P. c. KLINGLER El AL 2,112,850

PUNCHING MACHINE AND THE LIKE Filed Aug. 3, 193a e Sheets-sheaf. 6

- I NVEN TORS I TNESSES- w Paul L. Klin Zer 13 k ggpryg w y,

A TTORNEYS Patented Apr. 5, 1938 UNITED STATES PATENT OFFICE side, N.3., assignors to Super-Speed Press poration, Riverside, N. 1., acorporation of Delaware Application August s, 1936, Serial No. 94,030

20 Claims.

This invention relates to the working of sheet material to desiredoutlines or configurations, as by punching or die-working operations inmachines of the type commonly known as punching machines, which are usedespecially for blanking articles of different configurations from paper,cardboard, sheet metal and other kinds of strip or sheet material. Inmany machines heretofore designed for this purposejthe practice is tointermittently actuate the punch or die(s) in alternation with the feedmeans by which the strip or sheet material is advanced. Due to theintermittent and alternate action of the feeding and punching mechanism,the operation of such machines is attended by excessive vibration whichhas a limiting influence upon their speed, and, in turn, upon theiroutput. This is especially serious in the punching or die-working ofsheet metal of any thickness or toughness, because of its resistance todeformation by the punch or die(s).

A further disadvantage of prior art punching machines of the typereferred to is that the intermittent and jerky operation of the feedmeans caused overrunning of the supply rolls from which the stripmaterial was drawn. This resulted in vaquent wastage in material theextent of which mounted rapidly with quantity production and thus addedproportionately to production cost.

The chief object of our invention is to overcome the above indicateddrawbacks; that is to say: we aim to minimize vibration in punchingmachines with a view toward making it possible to operate them at muchhigher speeds than heretofore, and to thereby secure a correspondinglygreater production from them, and at the same time preclude unnecessarywaste in the material.

hereinafter more fully disclosed, through provision of a feed meanswhereby the sheet or strip material is continuously advanced in themachine, and a synchronously operated, rotarily actuated,

oscillating punch which penetrates the material while moving in the samedirection therewith.

In connection with punching machines having the above-mentionedattributes, it is a further aim of our invention to provide meanswhereby the crank throw can be adjusted to vary the oscillating motionof the punch, and the crank shaft positionally adjusted compensatively,to adapt the machine for punching blanks of different sizes 'jfrommaterials of different thicknesses. Another objectof our invention is toprovide These desiderata, we realize in practice, as.

a simple balanced drive system with interposed adjustable means wherebythe operation of the 'die means and the feed means can be regulated inaccordance with the length of the blanks which are to be punched in themachine so as to avoid waste of the material between successivepunchings.

Other objects and attendant advantages will appear from the followingdetailed description of the attached drawings:

Fig. I shows the plan view of a punching machine conveniently embodyingour invention.

Fig. II is a side elevation of the machine looking from the right ofFig. I.

Fig. III is a fragmentary longitudinal sectional view of the machinedrawn to a larger scale and taken as indicated by the arrows lII-III inFig. I.

Fig. IV is a cross-sectional view of the machine taken as indicated bythe arrows IV--IV in Figs. I and III.

Fig. V is a detail sectional view taken as indicated by the arrows V-Vin Figs. I and IV.

Fig. VI is an exploded perspective view of the crank shaft of themachine.

Figs. VII and VIII aredetail views showing the crank set in differentpositions of adjustment relative to the shaft axis.

, Fig. IX is a detail sectional view taken as indicated by the arrowsIXIX in Fig. III, and

Fig. X is a view corresponding to Fig. III showing an alternativeembodiment of our invention.

Referring first to the form of our invention illustrated in Figs. I-IX,the framework of the ma= chine consists of two suitably spaced sideframes or standards I, and a supporting base 2. As shown the base 2 isrecessed as at 3 for capacity to serve as a catch pan for fluid used inlubrieating the strip or sheet material M which is being punched in themachine. Bolted to the opposite ends of separable upper sections 4 ofthe side frames l, are transversely-aligned journal brackets 5 and 5respectively for cooperative pairs of superposed feed rolls 1, 8 and 9,I0 whereby the strip or sheet material M is continuously drawn from asupply roll (not illustrated) and progressed horizontally through themachine in the direction indicated by the arrows in,Figs. I- and III.The shafts H and ll! of the lower, feed rolls 8 and Hi are directlyjournalled in the brackets 5, 6; while the shafts I3, l4 of the upperrolls 9 and l I are rotatably supported by bearing blocks l5, l5 engagedin the vertical guide ways l'l, I8 of said brackets. The bearing blocksl5, is are urged downwardly by compression springs I9, 20

(see Figs. I and III) and in order that the upper feed rolls 1, 9 may besimultaneously lifted clear of the lower feed rolls 3, l3 to permitinitial threading of the material M between said rolls, we have provideda manually operable roll-lifting means which is illustrated to the bestadvantage in Figs. I, IIIand Ix. As shown, this roll-lifting meanscomprises a pair of transverse rock shafts 2|, 22 with amxed rotary cams23, 24 that respectively bear on the tops of the brackets 5,3,and witharms 25, 23 which are coupled by means of a link 21, which extendslongitudinally of the machine. Also affixed to the rock shafts 2|, 22are operating handles 23, 29 respectively. Thus, with this arrangement,by swinging either of the handles 23, 29 clockwise from the positionshown in Fig. III, the coupled rock shafts 2|, 22 will becorrespondingly rotated and the upper feed rolls 1, 9 elevated as shownin Fig. V, by action of the rotary cams 23, 24 in a manner readilyunderstood.

Supported for horizontal reciprocation in guide ways 33 at the innersides of the upper sections 4 of the standards I, is a carriage 3| withhanger brackets 32 which respectively engage said guide ways. (see Figs.III and IV). As shown, the carriage 3| comprises upright side members 33which, at their bottoms are bolted to the ends of a transverseconnecting member 34 and which, at their tops, are connected bytransverse tie rods Confined to up and down movement in vertical guideways 33 afforded by the end members 33 of the carriage 3|, is atransversely-extending bar-like slide or head 31 whereto is secured,centrally of its bottom, a punch or male die member 33 which is adaptedto cooperate with a block or female .die member 39 correspondinglylocated on the bottom cross member or bar 34 of said carriage. As shownin Fig. III, thecontinuously travelling sheet material M extendingbetween the pairs of feed-rolls 1, 3 and 9, l3 passes over the part 39on the carriage 3| and under the part 33 on the slide 31, so that whenthese parts 33, 39 come together on the material M while travelling withit (under actuation as hereinafter described), they coact in die-workingor punching the material, as the male member 33 presses the materialagainst the member 39, and itself even enters into said member 39. FromFig. III, it will be noted that one side of each vertical guide way 33of the carriage is formed by a wedgeshaped bar 43 which can bepositionally adjusted vertically to take up wear from time to time, bymeans' of adjusting screws 4|.

Bolted to the tops of the separable sections 4 of the side frames of themachine at the center are supporting blocks 42 with openings forcircular bushings 43 which have eccentrically-disposed bearing apertures44 (Fig. V) for the journalling of a transverse shaft 45. As shown inFigs. I and 111, this shaft 43 has a medial eccentric crank 43 whichpasses through aligned bearing apertures in the upstanding end portions41 of the punch-carrying slide or head 31 to actuate the latter.,Operating on and through the slide 31, the crank 43 reciprocates thecarriage 3| and the parts 33, 39 to and fro horizontally, and also movesthe part 33 down and up toward and from the part 39. By rotativelyadjusting the bushings 43 in the supporting blocks 42, the level of thecrank shaft 45 can be altered with respect to the material M passingthrough the machine, for a purpose explained hereinafter. In order thatsuch adjustments may be effected with accuracy, the bearing bushings 43are formed with gear teeth anasuo 43 which mesh with worms 49 onygiaralle'l shafts 53 which latter extend longitudinally of the machineand have their opposite ends respectively journalled in bearingstandards 5| secured to the bearing brackets 5 for the feed rolls 1, 3and in bearing lugs 32 on the journalsupporting blocks 42 for the crankshaft 45. A cross shaft 53 also journalled in the bearing standards 5|has bevel gears 55 at opposite ends thereof which mesh with bevel gears53 on'the parallel shafts 33, the latter being rotatable by means of thehand wheel indicated at 51. It will be noted that the bearing blocks42.are split as at 53 and provided with clamp screws 59 for fixing thebushings 43 in adjusted positions.

As shown in Figs. IV, and VI, the crank shaft 45 is of multipartiteconstruction, including outer sections 33 with concentric end discs 3|having eccentrically disposed recesses 32 in their opposing faces, andintermediate sections 33 with end discs 34 which are eccentric to theeccentriccrank portions 43 between them, and which flt into saidrecesses 32. The crank portions 43 of the intermediate sections 33 ofthe shaft 45 meet at the center of the machine and are connected asshown in Figs. I, IV, and VI by a spline collar 35. The severalcomponent sections of the crank shaft 45 areheld assembled by flangerings 33 (Figs. IV, VI, VII and VIII) which are detachably secured tothe inner faces of the discs 3| by screws, and which marginally overlapthe corresponding faces of the discs 34 of the inter mediate sections33. By rotating the discs 34 of the sections 33 within the eccentricrecesses 32 of the discs 3| of the outer sections 33, it is pos- 1 sibleto vary the throw of the crank 43, for a purpose later on explained. Asan aid in making the adjustment just referred to, the discs 34 aregraduated as shown in Figs. VII and VIII for coordination with marks 31on the rings 33. Also,

as shown in Figs. VII and VIII and in Fig. VI, the discs 3| are radiallysplit as at 33 and provided with clamp screws 39 for fixing the parts inadjusted positions. Relatively heavy fly wheels 13 adjacent oppositeends of the shaft 45 are relied upon to balance the action of the crank43 and the parts connected thereto.

The driving mechanism of the machine includes an electric motor 1| whichis mounted on a supporting bracket secured to one of the side frames Theshaft 12 of the motor carries a self-adjusting pulley 13 of a well-knowntype having laterally-shiftable opposing cone components 14 which aresubject to a compression spring 15 as shown in Fig. I, said pulley beingconnected by a belt 13 with one of the fly wheels 13 on the crank shaft45. Supported by a bracket 11 at the side of the machine opposite that00- cupied by the motor 1| (see Fig. II) is a Reeves variable speeddevice 13 whereof the input shaft 19 is driven by a sprocket chain 33from the crank shaft 45. The output or deliveryshaft 3| of the variablespeed device 13 is in turn connected by a sprocket chain 32 with a stubshaft 83 suitably journalled in the upper frame component 4 at,v

the corresponding side of the machine, from which the lower feed roll ofthe pair 1, 3 is driven shaft 31 having miter gears 33, 39 at oppositeends thereof meshing respectiveLv with companion miter gears 90, 9I onthe shafts I I, I2 of said lower feed rolls. By means of the variablespeed device I8, the rate of feed of the material M by the rolls I. 8and 9, I0 can be adjusted as desired relative to the operation of theeccentriccrank actuator 46 for the members 38, 39. Thus the horizontalmovement of these parts 39, 39 can be matched with that of the materialM at the moment when said parts are actually act.- ing on the materialas described above: in other words. the device I8, serves forsynchronizing the.

speed and feeding action of the feed rolls I, 9 and 9, I0 with themovement of the parts 38, 39 parallel with the sheet material when thelatter is being deformed or punched.

Associated respectively with the fly wheels I0 are expanding brake shoeswhereof one set is shown at 92 in Fig. II, said shoes being adapted tocooperate with the inner peripheries of drums 98 which may be eithersecured to or integrally formed with said fly wheels. The wedge pins 94for the brakes are supported in arms 95 hung from opposite ends of thecrank shaft 45, the lower ends of said arms being freely engaged inopenings 96 in the projecting ends of a centrally allocated fixed crossbar 91 by which the side frames I of the machine are connected at thetop. The means for operating the brakes includes a pedal 99 which issecured to a transverse rock shaft 99 journally in the lower part of themachine frame, and which is normally held elevated against a fixed stopI00 by a helical tension spring IOI. Arms I02 at opposite ends of therock shaft 99 are coupled by vertical links I03 with the actuating armsI05 on the wedge pins 94 of the brakes. As shown in Fig. 11, each of thelinks I03 is made in two sections I06, I01 which are coupled at I08 withcapacity for lost motion for a purpose presently explained. To the lowersection I0'I of the link I03 is secured a collar I09 for coacting withthe finger IIII of a snap switch II I which is secured to the frame I atthe corresponding side of the machine and interposed in the powercircuit I I2 of the electric motor--all as shown in Fig. II. The blankspunched from the material M drop through an opening I I3in the bottommember 34 of the carriage 3I upon an underlying endless reticulate apron4 which may be of wire mesh, and which, as shown in Figs. II and III istrained about supporting pulleys II 5, II 6. The shaft II 1 of thepulley I I5 is journalled in bearing brackets II8 secured to the upperframe members 4, and the shaft II9 of the pulley H6 in suitable bearingsI20 afforded by said frame members. The apron II 4 is driven at a speedslightly less than that of the material M by a belt connection I 2!(Fig. II) with the shaft I2 of the lower feed roll of the pair 9, I0,and delivers the blanks to-a suit-' able point of disposal.

For the purpose of lubricating the material M and thereby facilitatingthe blanking, we have fitted the machine (see Figs. I and III) withtransverse troughs I22, I23 for fluid lubricant respectively above andbelow the plane of travel of said material. Under control of adjustablenozzles I24, lubricant is released from the upper trough I22 to dropupon'an applicator roll I25 which runs in contact with the top surfaceof the material; while another applicator roll I26 serves to evenlydistribute lubricant from the lower trough over the bottom face of saidmaterial. Excess lubricant dripping from the material M or the deliverybelt H4 falls into the hollow of the base 2 from which it may be drainedfrom time to time as occasion requires.

The operation of the machine Is as follows: Byrotation of the crankshaft 49, the carriage 3| is moved back and forth on the guides 90parallel to the material M which is continuously advancing,horizontally, from right to left in Figs. I and III, and lubricated bythe rolls I 29, I29 associated with the lubricant troughs I22, I23.

Assuming the speed of the shaft to be synchronized with that of the feedrolls I, 8 and 9, I0, it will be apparent that during each rotation ofthe crank 46, a blank B will be punched from the material M by the punch38 when the carriage 3| moves in the same direction as said material,the motion of said punch during each cycle being an oscillating one. Asa consequence of this, and by virtue of continuous progression of thematerial M, it will be apparent that vibration is reduced to a minimumso that the machine can, with safety, be operated at much higher speedsthan attainable with machines heretofore designed for punching, and acorrespondingly greater output secured. The blanks B successivelypunched from the sheet M drop in overlapping relation, as shown in Fig.III, upon the apron II4. Through proper setting of the crank 46, toadjust its throw, as above described, the punchings may be closelyspaced with resultant preclusion of unnecessary waste in the material.Also, by this adjustment of the throw or eccentricity of the crank 46 tovary the extent of travel of the parts 38, 39 parallel with the sheetmaterial M between the feed rolls I, 8 and 9, I0, and correspondingadjustment of the variable speed device I8 (if necessary) to synchronizethe speed of the feed rolls 1, 8 and 9, I0 with the movement of thepunch 38, the machine may be adapted to produce blanks B of differentsizes from materials of different thicknesses. Of course the differencein size to which the machine must be adapted by adjusting the throw oreccentricity of the die or punch-actuating eccentric-crank is adifference in the dimensions of the die(s) or punch in the common(horizontal) direction of travel of the parts 38, 39 and the material M.Adjustment of the height of the crank shaft 45 and of its distance fromthe lineof travel of the material M (by means of the eccentric bearings43) is generally required when a substantial change in the crank throwor eccentricity is made, to compensate for the effect of such change onthe coming together of the parts 38, 39. Again, when general speedchanges are desired or required between the shaft 45 and the feed rolls'I-I0, the gears 85, 86 may be removed and others of a different ratiosubstituted. Incident to adjustment of the crank shaft bearings 43 asabove explained, the pulley I3 on the shaft I2 of the motor 'II willadapt itself to the pull on the belt I6 due to the change in distancebetween the shafts 45 and I2.

In the alwrnative form of our invention-illustrated in Fig. X, thepositions of the carriage 3Ia, the punch 38a and the die block 39a arereversed, so that the punching is effected through upward displacementof the blanks from the material M which is continuallyadvancedhorizontally in the machine as before by the feed rolls Ia, 8a and 9a,Illa. In lieu of a delivery belt, we

tops by attached transverse angle pieces I33. The

angle pieces I are secured at their ends to fixed standards at oppositesides of the machine, one

of which is indicated at III, with capacity for adjustment so that themagazine can be adapted for blanks B of different sizes. Attached angleclips I near the bottom ends of the strips I12 are similarly secured,with capacity for adjustment to the top of the carriage In as shown.Accordingly as the carriage Jla moves back and forth, the end wallstrips I32 of the magazine I" flex to accommodate such movement with theaccumulated blanks B held between them. Since the magazine I is of openconstruction and stationarily held at the top, the blanks B can bereadily withdrawn from time to time by hand while the machine isrunning. In all other respects, the machine of- Fig. x is identical inconstruction and .operation with the first described form of ourinvention. Accordingly in order to preclude the necessity for duplicatedescription, all corresponding parts which have not been specificallyreferred to are indicated by the same reference numerals which werepreviously employed, except that in each instance, the letter a-has beenadded for the purpose of distinction.

Having thus described our invention, we claim:

1. A machine for die-working sheet material comprising means forcontinuously feeding the sheet material, male and female die members atopposite sides thereof, actuating means for said die members operativeat each actuation to cause them to travel with the material as well asto come together on it and one into the other, means for adjusting therate of feed in relation to the operation of said actuating means, andmeans for adjusting said actuating means to vary the extent of travel ofsaid die members, so as to adapt the machine for operation with diemembers whose dimensions in the direction of travel are different. 7

2. A machine for die-working sheet metal comprising means forcontinuously feeding the sheet metal, maleand female die members atopposite sides thereof, an eccentric rotary actuator for moving said diemembers to and fro substantially parallel with the line of travel of thesheet metal, and for also bringing them together on it and one into theother while moving with the sheet metal, and means for adjusting theeccentricity of said actuator to vary the extent of travel of said diemembers, so as to adapt the machine for opera-. tion with die memberswhose dimensions in the direction of travel are different.

3. A machine for die-working sheet metal comprising means forcontinuously feeding the sheet metal, male and female die members atopposite sides thereof, an eccentric rotary actuator for moving said diemembers to and fro substantially parallel with the line of travel of thesheet metal, and for also bringing them together on it and one into theother while moving with the sheet metal, means for adjusting theeccentricity of said actuator to vary the extent of travel of said diemembers, so as to adapt the machine for operation with die members whosedimensions in the direction of travel are diiferent, and means foradjusting the distance of the actuator axis from the line of travel ofthe sheet metal to compensate for the effect of change in theeccentricity of the actuator on the coming together of the die members.

4. A machine for punching sheet material com prising means forcontinuously feeding the sheet material, coacting punch and blockmembers at opposite sides thereof, an eccentric rotary actuator formoving said members to and fro substantially parallel with the line oftravel of the sheet material, and for also bringing them together on itto punch it while moving with it, and means for adjusting theeccentricity of said actuator to vary the extent of travel of saidmembers, so as to adapt the machine for operation with punches whosedimensions in the direction of travel are 7,

diflerent.

5. A machine for punching sheet material comprising means forcontinuously feeding the sheet material, coacting punch and blockmembers at opposite sides thereof, an eccentric rotary actuator formoving said members to and fro substantially parallel with-the line oftravel of the sheet material, and for also bringing them together on itto punch it while moving with it, means for adjusting the rate of feedin relation to the operation of said actuator, and means for adjustingthe eccentricity of said actuator to vary the extent of travel of saidmembers, so as to adapt the machine for operation with punches whosedimensions in the direction of travel are different.

6. A- machine for die-working sheet metal comprising means forcontinuously feeding'the sheet metal, male and female die members atopposite sides thereof, a carriage carryin one of said members andguided for movement to and fro substantially parallel with the line oftravel of the sheet metal, a slide carrying the other member, withguideways for said slide on said carriage substantially at right anglesto the sheet metal as it passes the carriage, a rotary eccentric-crankengaged with said slide and operating therethrough to reciprocate thecarriage, and also bringing said die members together'on the sheet metaland into one another while moving with the sheet metal, and means foradjusting the eccentricity of said eccentric crank to vary the ex-' tentof travel of said member s, so as to adapt the machine for operationwith die members whose dimensions in the direction of travel aredifferent.

7. A machine for punching sheet metal comprising means for continuouslyfeeding the sheet metal, punch and block members at opposite sidesthereof, a carriage carrying one of said members and guided for movementto and fro substantially parallel with the line of travel of the sheetmetal, a slide carrying the other member, with guideways for said slideon said carriage substantially i; right angles to the sheet metal as itpases the carriage, a rotary eccentric-v punches whose dimensions in thedirection of travel are different, and means for adjusting the distanceof the eccentric-crank axis from the line of travel of the sheet metal,to compensate for the efi'ect of change in the eccentricity of theeccentric-crank on the coming together of said punchand block members.

8. A punching machine comprising means for continuously feeding sheetmaterial horizontally;

a carriage confined to movement parallel with the material; a punch onthe carriage confined to vertical movement; and a rotary shaft with a vcrank engaging the punch whereby the carriage 2,119,850 is moved backand forth and the punch reciprov gaging the punch whereby the carriageis moved back and forth and the punch reciprocated vertically in thecarriage to penetrate the material during the movements of the carriagein the direction of travel of the material; and eccentric bearings forthe ends of the crank shaft rotatably adjustable in fixed supports ofthe machine frame.

10. A punching machine for continuously feeding sheet materialhorizontally; a carriage confined to movement parallel with thematerial; a punch on the carriage confined to vertical movement; arotary shaft with a central crank engaging the punch whereby thecarriage is moved back and forth and the punch reciprocated verticallyin the carriage to penetrate the material during the movements of thecarriage in the direction of travel of the material; eccentric bearingsfor the ends of the crank shaft rotatably adjustable in fixed supportson the machine frame; and means whereby the bearings can be concurrentlyrotated in making the adjustments.

11. A punching machine for continuously feeding sheet materialhorizontally; a carriage confined to movement parallel with thematerial; a punch on the carriage confined to vertical movement; arotary shaft with a central crank engaging the punch whereby thecarriage is moved back and forth and the punch reciprocated in thecarriage to penetrate the material during the movements of said carriagein the direction of travel of the material; eccentric bearings for theends of the crank shaft rotatably adjustable in fixed supports on themachine frame; and means whereby the bearings may be concurrentlyrotated in making the adjustments including worms in engagement withcircumferential teeth on the bearings and. coordinating operatingconnec-- movements of the carriage in the direction oftravel of thematerial; and a drive system with means whereby the speed of the sheetfeeding means and the shaft may be synchronized.

13. A punching machine comprising feeding means for sheet materialincluding spaced pairs of cooperating feed rolls; a carriage confined toreciprocating movement parallel with the material in the intervalbetween the feed rolls; a punch on the carriage confined toreciprocating movement at right angles to the material; a rotating shaftwith a crank engaging the punch whereby the carriage is moved back andforth and the punch concurrently reciprocated in the carriage topenetrate the material during movement of said carriage in the samedirection as the material; drive means for rotating the shaft; driveconnections between said shaft and the feed rolls; brake means for theshaft; and control vmechanism whereby the drive "means is renderedineffective concurrently with application of the brakes.

14. A punching machine comprising feeding means for sheet materialincluding spaced pairs o'f cooperating feed rolls; a carriage-confinedto movement-parallel with the material in the interval between the feedrolls; a punch on the carriage confined to movement at right angles tothe material; a rotating shaft with a crank engaging the punch wherebythe carriage is moved back and forth and the punch concurrentlyreciprocated in the carriage to penetrate the material during themovement of said carriage in thesame direction as the material; driveconnections between the shaft and the feed rolls; an electric motor fordriving the machine; a switch in circuit with the motor; brake means forthe shaft; and control means whereby the switch is opened concurrentlywith application of the brake.

15. A punching machine comprising means for continuously feeding sheetmaterial; a carriage confined to movement parallel with the material; apunch on the carriage confined to movement at right angles to thematerial; a rotating shaft with a crank engaging the punch whereby thecarriage is reciprocated and the punch concur-- rently actuated topenetrate the material during the movements of said carriage in the samedirection as the material; drive connections between said shaft and thefeed means; and an adjustable variable speed means interposed in saiddrive connections whereby the movements of the shaft and the rolls maybe synchronized.

16. A punching machine comprising means for continuously feeding sheetmaterial including spaced pairs of cooperating feed rolls; a carriageconfined to movement parallel with the material in the interval betweenthe feed rolls; a punch on the carriage confined to movement at rightangles to the material; a rotating shaft with a crank engaging the punchwhereby the carriage is moved back and forth and the punch concurrentlyreciprocated in the carriage to penetrate the material during themovements of said carriage in the same direction of feeding; drive meansfor rotating the shaft; drive connections between said shaft and thefeed rolls; a weighted fiy wheel on the shaft; a brake associated withthe fiy wheel; and control mechanism for rendering the drive ineffectiveconcurrently with application of the brake.

1'7. A punching machine comprising spaced pairs of cooperating feedrolls for continuously advancing sheet material horizontally; a carriageconfined to horizontal movement in the interval between said feed rolls;a punch confined to vertical movement in the carriage; rotary means forreciprocating the carriage and for actuating the punch to penetrate thematerial during movements of the carriage in the direction of feeding;adjustable drive connections whereby the speed of the feed rolls and theshaft may be synchronized; 'a delivery belt underlying the material forreceiving the punchings; and means whereby said delivery belt is drivenfrom one of said feed rolls.

18. A punching machine comprising means for continuously advancing sheetmaterial horizontally; a carriage confined to horizontal movementparallel with the material; a punch confined to vertical movement in thecarriage; means for reciprocating the carriage and for actuating thepunch to'penetrate the material from beneath during movements oi thecarriage in the same direction as the material; a die on the carriage tocoact with the punch; and a magazine above the die to receive and retainthe punchings.

19. A punching machine comprising means for continuously advancing sheetmaterial horizontally; a carriage confined to movement parallel with thematerial; a punch confined to vertical movement in the carriage; meansfor reciprocating the carriage and for actuating the punch to 15penetrate the material from beneath during movements of the carriage inthe same direction as the material; a die on the carriage to coact withthe punch; and a magazine of open construction above the carriage, saidmagazine having vertical end walls of flexible strip metal stationarilysupported at their tops and having their lower ends connected to thecarriage so as to flex in responding to the movements of the latter.

20. A punching machine according to claim 19, wherein the walls 01' themagazine can be adjusted tor the accommodation of punchlngs oi.diflerent sizes.

PAUL C. KLINGIER. GEORGE ESCHEFFEY.

